Desulfurization wastewater treatment system

Abstract

The invention provides a desulfurization wastewater treatment system. The desulfurization wastewater treatment system comprises a wastewater buffer tank, a pretreatment system, a bicarbonate medication device and a dual-fluid atomizing nozzle, wherein the pretreatment system is arranged at an inlet end of the wastewater buffer tank; the bicarbonate medication device is used for adding bicarbonate into the wastewater buffer tank; and an air compressor is connected to an air inlet of the dual-fluid atomizing nozzle, and a water inlet of the air compressor is connected with a water outlet of the wastewater buffer tank. After entering a flue, desulfurization wastewater is evaporated under the action of waste heat of flue gas; the desulfurization wastewater reacts with SO3 in flue gas; the desulfurization wastewater easily generates decomposition reaction when being heated; by virtue of carbon dioxide generated in two reactions, the perturbation of liquid drops cane be further accelerated, and secondary fog drops are easily generated, and meanwhile, the heat and mass transfer processes of fog drops and flue gas must be accelerated by virtue of reaction between gas and liquid phases; and besides, generated carbonate can rapidly react with a small amount of soluble calcium and magnesium ions in the desulfurization wastewater so as to form a core and release heat, so that the evaporation time of the fog drops can be effectively shortened, and a wastewater zero discharging effect is improved.

Description

technical field [0001] The invention relates to the technical field of waste water treatment in thermal power plants, and more specifically relates to a desulfurization waste water treatment system. Background technique [0002] The main sewage of coal-fired power plants are: domestic sewage, coal-containing wastewater, circulating water cooling tower sewage and desulfurization wastewater. Domestic sewage, coal-containing wastewater, circulating water cooling tower and other sewage are generally treated as make-up water and reused in the desulfurization tower after simple physicochemical and biochemical treatment. As the terminal wastewater of coal-fired power plants, desulfurization wastewater has the characteristics of poor water quality, complex composition, high salinity, and difficulty in recycling. It has always been a key problem for zero discharge of wastewater in coal-fired power plants. [0003] Flue gas waste heat evaporation technology, as a new, efficient and e...

AI Technical Summary

Problems solved by technology

Therefore, the evaporation time required for the complete evaporation of the larger atomized particle size is longer, and it is easy to cause the limited length of the evaporation flue to meet the evaporation time required for the complete evaporation of the larger atomized particle size; or the length of the evaporation flue Short, it is difficult to meet the evaporation time required for the complete evaporation of the atomized particle size, which affects the effect of zero discharge of wastewater

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